Answers
A student builds a model of a race car. The scale is 1:15. In the scale model, the car is 8 cm tall. How tall is the actual car?
Answers:A. 120 cm#CarryOnLearning
Related Questions
how many atoms of zinc are required to weigh 5.4 ng
Answers
Answer:
4.97 X 10^13 ATOMS OF Zn
Explanation:
how many atoms of zinc are required to weigh 5.4 ng
a nano gram is 10^-9 grams
Zinc has an atomic mass of 65.39 gm/moles
there is an Avogadros number of atoms in a mole
65.39 GRAMS PER MOLE
65.39 g/(6.022 X 10^23)how many atoms of zinc are required to weigh 5.4 ng
GRAMS PER ATOM
1.086 GRAMS PER 1O^22 ATOMS
1 atom of Zn weighs 1.086 X 10^9 X 1O^-22 n grm=
1,086 X 10^-13 n gm
Y tines 1.086 X 10^-13 = 5.4 n gm
Y = 5.4/ (1.086 X 10^-13) =
4.97 X 10^13 ATOMS OF Zn
CHECK
(4.97 X 10^13 ) X 65.39 gm/(6.022 X 10^23) =
5.397 X 10^-9 =
5.4 n g
What type of energy is best described as the energy required to break the bonds present in the reactants?
A
activation energy
B
potential energy
С
kinetic energy
D
thermal energy
hay
Answers
Answer:
b
Explanation:
Haty
The energy required to break the bond in the reactants is activation energy .
Hence, option (A) is correct answer.
What is Exothermic Reaction ?The chemical reaction which releases energy are known as exothermic reaction. Bond forming is exothermic process. Activation energy is needed to initiate the reaction. In exothermic reaction potential energy converted into kinetic energy.
What is Endothermic Reaction ?The chemical reaction which absorbs heat from the surrounding is known as endothermic reaction. Bond breaking is endothermic reaction. Activation energy is needed to initiate the reaction. In endothermic reaction kinetic energy converted into potential energy.
Thus, from the above conclusion we can say that The energy required to break the bond in the reactants is activation energy .
Hence, option (A) is correct answer.
Learn more about the Exothermic and Endothermic reaction here: https://brainly.com/question/6357350
#SPJ2
How many moles of the excess reagent would there be if 2.8mol of N2 were reacted with 15.1mol of H2O?
N2+4H2O ---> 2H2O2+N2H4
Answers
The number of moles of the excess reagent there would be is 3.9 moles
From the question,
We are to determine the number of moles of the excess reagent there would be.
The given balanced chemical equation is
N₂ + 4H₂O → 2H₂O₂ + N₂H₄
This means,
1 mole of N₂ is required to react completely with 4 moles of H₂O
Now,
If 1 mole of N₂ is required to react completely with 4 moles of H₂O
Then,
2.8 moles of N₂ will react completely with 11.2 moles of H₂O
∴ H₂O is the excess reagent
Number of moles of H₂O that would remain = 15.1 mol - 11.2 mol
Number of moles of H₂O that would remain = 3.9 mol
Hence, the number of moles of the excess reagent there would be is 3.9 moles
Learn more here: https://brainly.com/question/2762206
The small flag indicating wind direction on a station weather plot points in the direction that the wind is going.
True or False
Answers
Answer:
False
Explanation: The wind's direction is shown by a long shaft. it will point to the direction from which direction the wind is blowing.
A unit for measuring work is called the _____.
horsepower
effort
time
foot-pound
Answers
Answer:
A unit for measuring work is called the foot-pound
What is the answer to this question
Answers
Answer:
(i) of protons
(ii) total number of both protons and neutrons
(b)they are neutral or have no overall charge because there are equal numbers of negative electrons to positive protons
Explanation:
Since both charges are equal, the number of positive protons cancels the number of negative electrons, thereby making the atom neutral
The Temperature of the earth gets______ as you get closer to the _______ and ________ as you move towards the_____
Answers
Make a neutral Beryllium atom by adding protons, neutrons and electrons. Now, what would you do to make a
beryllium atom with a negativecharge?
Answers
Answer:
4 protons, 5 neutrons, 4 electrons to have the neutral Be atom
the only way to make a negative Be is to have more than 4 electrons
Explanation:
Make a neutral Beryllium atom by adding protons, neutrons and electrons. Now, what would you do to make a
beryllium atom with a negative charge?
Be has an atomic number of 4, an atomic mass 9
its atomic number tells us it has 4 protons, with a +4 charge
its atomic mass = neutrons + protons, so it has 5 neutrons with no charge
its neutral atom will have 4 electrons each with a negative charge to balance the +4 total proton harge.
so
4 protons, 5 neutrons, 4 electrons to have the neutral Be atom
to make a negative Be species, it still must have an atomic number of 4,
or it is not Beryllium
so the only way to make a negative Be is to have more than 4 electrons
what are the products of the reaction: Be(s)+ Cl2(g)⟶
Answers
Answer:
BeCl2
Explanation:
Be+Cl2=BeCl2
question is in the pic
Answers
Answer:
?????????????????????????????????????
Explanation:
For each of the following reactions, write a balanced complete chemical equation, ionic equation,
and net ionic equation.
Identify and label any spectator ions if applicable, and identify the type of reaction taking place.
Make sure to include states of matter.
a. Liquid bromine reacts with a solution of hydrochloric acid.
b. Cobalt (II) iodate is mixed with a solution of iron (III) oxalate
Answers
This question is asking for the complete, ionic and net ionic chemical equations for the reaction between liquid bromine with a solution of hydrochloric acid and cobalt (II) iodate mixed with a solution of iron (III) oxalate.
In this case, according to the given information, it turns out possible to figure out the required, by considering that the complete chemical equation has the correct balance and states of all species involved, the ionic one shows the ionizable species and the net ionic do not show any spectator ion. In such a way, we proceed as follows:
a.
[tex]Br_2(l)+2HCl(aq)\rightarrow Cl_2(g)+2HBr(aq)[/tex]: Complete.
We can ionize HCl and HBr as they are aqueous:
[tex]Br_2(l)+2H^+(aq)+2Cl^-(aq)\rightarrow Cl_2(g)+2H^+(aq)+2Br^-(aq)[/tex]: Ionic
Finally, we cancel out the hydrogen ions as the spectator ones:[tex]Br_2(l)+2Cl^-(aq)\rightarrow Cl_2(g)+2Br^-(aq)[/tex]
b.
[tex]3Co(IO_3)_2(s)+Fe_2(C_2O_4)_3(aq)\rightarrow 3CoC_2O_4(s)+2Fe(IO_3)_3(aq)[/tex]: Complete
We ionize the iron-containing species:
[tex]3Co(IO_3)_2(s)+2Fe^{3+}(aq)+3(C_2O_4)^{2-}(aq)\rightarrow 3CoC_2O_4(s)++2Fe^{3+}(aq)+6(IO_3)^-(aq)[/tex]
Finally, we cancel out the iron ions as the spectator ones:
[tex]3Co(IO_3)_2(s)+3(C_2O_4)^{2-}(aq)\rightarrow 3CoC_2O_4(s)+(aq)+6(IO_3)^-(aq)[/tex]
Learn more:
https://brainly.com/question/15466794https://brainly.com/question/15467507Pls answer.............
Answers
Answer:
Ductile
Explanation:
The metal is ductile, and that is why it can be stretched into wires.
Which object represents a heterogeneous
mixture
Answers
Answer:
oil and water
Explanation:
oil and water - When you put oil and water together they do not mix. Therefore, these are a heterogeneous mixture since they are two separate parts.
1. Write a balanced equation for the precipitation of calcium carbonate from potassium carbonate and calcium chloride.
Answers
Answer:
K2CO3(aq) + CaC12(aq) –> CaCO3(s) + 2Cl(aq) 2.
Explanation:
Read the etymology entry.
antagonize
antagonize (v.) 1630s, "to compete with" (obsolete); 1742, "act in opposition to, struggle against continuously,"
from Greek antagonizesthai "to struggle against, oppose, be a rival," from anti "against" (see anti-) + agonizesthai
"to contend for a prize," from agon "a struggle, a contest" (see agony). Meaning "make antagonistic" is by 1882.
What original language did the word antagonize come from?
O Greek
O Latin
O Middle French
O Middle English
Answers
Answer:
latin
Explanation:
im not sure sorry if wrong
Answer:
Greek
Explanation:
Mid 17th century (in the sense 'compete with'): from Greek antagōnizesthai, from ant- 'against' + agōnizesthai 'struggle' (see agonize).
What are the causes and consequences of climate change
Answers
Answer: Humans are increasingly influencing the climate and the earth's temperature by burning fossil fuels, cutting down forests and farming livestock.
Explanation: This adds enormous amounts of greenhouse gases to those naturally occurring in the atmosphere, increasing the greenhouse effect and global warming.
4.6 CONCEPT ASSESSMENT Suppose that each of these reactions has a 90% yield. CH4(g) + Cl2(g) - CH2Cl(g) + HCl(g) CH3Cl(g) + Cl2(g) - CH2Cl20) + HCl(g) Starting with 50.0 g CH4 in the first reaction and an excess of Cl2(g), the number of grams of CH2Cl2 formed in the second reaction is (a) 50.0 X 0.81 x (85/16) (c) 50.0 X 0.90 X 0.90 (b) 50.0 X 0.90 (d) 50.0 X 0.90 X 0.90 < (16/50.5)(70.9/85)
Answers
Answer:
212 gm of CH2Cl2 are formed
Explanation:
4.6 CONCEPT ASSESSMENT Suppose that each of these reactions has a 90% yield. CH4(g) + Cl2(g) - CH2Cl(g) + HCl(g) CH3Cl(g) + Cl2(g) - CH2Cl20) + HCl(g) Starting with 50.0 g CH4 in the first reaction and an excess of Cl2(g), the number of grams of CH2Cl2 formed in the second reaction is (a) 50.0 X 0.81 x (85/16) (c) 50.0 X 0.90 X 0.90 (b) 50.0 X 0.90 (d) 50.0 X 0.90 X 0.90 < (16/50.5)(70.9/85)H
1st, rewrite the equations so you can see the problem easier
reaction (1) CH4 +Cl2--------->CH3CL + HCl
reaction (2) CH3Cl + Cl2------> CH2Cl2 + HCl
the product ib reaction (1) is CH3Cl and is formed with a 90% yield.
90% of the reactant methane iis converted to methyk chloride.
methane (CH4) has a molar mass of 12 + 4X1 =16
you start with 50.0 gm of CH4,
SO
50.0/16 =3.125 moles of CH4
90% of this become methyl choride...CH3Cl
SO
0.90 X 3.125 = 2.8 moles of CH3Cl are formed
NOTE 90% HAS ONLY 2 SIGNIFICANT FIGURES SO YOU ARE LIMITED TO 2 SIGNIFICANT FIGURES IN YOUR CALCULATION!
in reaction(2) 1 mole of methyl chloride becomes methyl dichloromethane yi
with again a 90% yield
0.90 X 2.8 = 2.5 moles of CH2Cl2 are formed
so
2.5 moles of CH2Cl2 are formed.
CH2Cl2 has a molar mass of 12 + 2X1 + 2X35.5 =
12 + 2 + 71 =85
1 mole weighs 85 gm
2.5 moles weigh 2.5 X 85 = 212 gm
X
Which of the following statements are TRUE for BOTH oxygen and sulfur atoms?
a. contain the same number of valence electrons on their outermost shell
b. have the same number of complete shells
c. atomic sizes are nearly the same
d. they are able to form sigma and pi bonds
e. their-2 change anion is isolemectronic to neon
Answers
Answer:
b. have the same kind number of complete shells
Compuesto organico que no existe como alqueno ni alquino?
Answers
Answer:
Susssssssssssssssy
Explanation:
Sup
Someone please help? I've had a go at this myself (see picture of working attached) but not sure where to go from there?
75ml of a solutipn of 0.1mol l-1 NaOH neutralises 25ml of a solution of an acid. The formula of the acid is HxA and the concentration of the acid is 0.1mol l-1. What is the value of x?
Answers
Answer:
75 ml of 0.1M base neutralizes 25 ml of 0.1M acid, which means the acid has 0.3 moles/L of H ion
but that means each molecule of the acid has 3 times as many H ions aH ions in a molecule of NaOH
which means the formula for the acid must be H3A and
the value of x in
HxA is 3
Explanation:
75ml of a solutipn of 0.1moL l-1 NaOH neutralises 25ml of a solution of an acid. The formula of the acid is HxA and the concentration of the acid is 0.1mol l-1. What is the value of x?
the concentration of both the and the base are the same at 0.1M
the base...NaOH has 0.1 moles/L of OH ion
75 ml of 0.1M base neutralizes 25 ml of 0.1M acid, which means the acid has 0.3 moles/L of H ion
but that means each molecule of the acid has 3 times as many H ions aH ions in a molecule of NaOH
which means the formula for the acid must be H3A and the value of x in
HxA is 3
An element with 3 valence electrons would be a
0-3 anion
0 + 3 anion
+3 cation
0 - 3 cation
Answers
Answer:
0+3 anion
Explanation:
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism's activities.
1. Assume samples that emit radiation are placed on a table across the room. Which sample will produce the greatest damage to you? Alpha emitter Beta emitter? Gamma emitter? WHY?
Answers
A question like this is quite nuanced, so let’s dive in.
Radiation that is made of charged particles (like alpha and beta) behave differently than radiation that is made up of neutral particles (like gamma). Charged particles are characterized by their “range”, which describes how far that particle can go through a medium (like air) before they lose their kinetic energy and become harmless. Alpha particles are relatively heavy and have a range of 1-10 cm in air at atmospheric pressure, so a sample that is an alpha emitter placed on the opposite side of the room will have exactly zero potential of dealing damage to you. You’re simply too far away. For a beta emitter, the range of beta particles is about 4 meters per MeV (a measure of the particle’s energy). This means that a low energy beta can reach you from across the room, and higher energy betas can easily reach you.
Neutral particles are not characterized by ranges, as they interact with matter differently. Instead, they are characterized by “half-thicknesses” based on an exponential attenuation function. The half-thickness of a material is the thickness of the material needed to reduce the intensity of the gamma rays to one-half the original intensity. Because of this, a gamma emitting sample will easily be able to affect you just like a beta sample would be. We now have to use something else to determine which will be worse.
In radiative studies, there exists a parameter for radiation types called the “quality factor”, which adjusts the value for radiation doses to account for the biological impact of each type of radiation. For example, if you were exposed to two different types of radiation with the exact same dose but one had a quality factor of one and the other had a QF of ten, then the radiation with a QF of ten did essentially ten times more damage than the other. Gamma rays have a quality factor of 1, whereas beta rays can have a QF anywhere from 1-20 based on their energy (higher energy = higher QF). Because of this, the beta emitter will likely do more damage than the gamma emitter.
Hope this helps!
The damage caused by the radiations has been maximum for the gamma radiations.
What are charged radiations?The charged radiations are comprised of the molecules that have been comprised of the charged particles. The charged particles have been alpha, beta or gamma radiation.
The damage that has been caused by the radiation has been found with the intensity of the quality factor and the thickness of the molecule that comprises the amount of damage formed.
The maximum quality factor has been for the gamma radiation. Thus, gamma radiations form the basis for the maximum damage.
Learn more about gamma radiations, here:
https://brainly.com/question/9815840
What happens to the pH of a solution is the concentration of hydronium ions decrease
Answers
can someone please help me i need this done rn
Answers
. Why do we experience night and day? A. The moon blocks out the Sun during the night. B. The moon blocks sunlight from getting to one side of Earth. C.The side of Earth facing the Sun receives the sunlight. D.the side of Earth facing the Sun does not receive sunlight.
Answers
Hello Darling, it's because (C) The side of the Earth facing the Sun receives sunlight.
Hope this help~ ^^
Answer: C
The side facing the Sun receives the sunlight. The side that doesn’t face the sun downs’t recieve sunlight. The side that receives the sunlight experiences day, and the side that doesn’t receive sunlight experiences night.
:)
When potassium metal is placed in water, a large amount of energy is released as potassium hydroxide and hydrogen gas are produced in the reaction 2K(s) + 2H2O(l) → 2KOH(aq) + H2(g). Your lab partner says this is a redox reaction and a combustion reaction. Do you agree? Defend your answer by explaining whether or not it meets the requirements of each type of reaction.
Answers
Answer:
is 2K(s)+2H2O(l)→2KOH(aq)+H2(g).
Explanation:
Answer:
pls explain better so we understand
how do you separate the following mixture? Name only the process involved .
1.Sand and salt
Answers
Answer:
Just dissolve in water , you can separate
Explanation:
because salt dissolves in water but sand doesn't
Explanation:
sedinentation and decantation
The city council of a small town wanted to add fluoride to their water so that all the residents would have
healthier teeth. The mayor had read that ionic compounds must be used to get the fluoride into water. He
looked up fluorine containing compounds and came up with the following list.
NaF
NFZ
SIF
CaF2
NHF
Using academic vocabulary in paragraph form, discuss the following:
Explain which compound(s) could produce fluoride ions in the water. In your response, be sure to include:
which of the listed compounds are ionic and which are covalent.
• how ionic and covalent compounds are different.
why only ionic compounds would produce fluoride in water.
Answers
Answer: NaF is ionic. NF3 is covalent. SiF4 is ionic. CaF2 is Ionic and NH4F is also ionic. Ionic compounds transfer electrons whereas covalent compounds share electrons hence the word "co". Also, ionic compounds are formed with metal and nonmetal. Where a covalent is with 2 nonmetals. Only ionic compounds would produce fluoride in water because ionic compounds can dissolve in water and covalent compounds cant.
Which element in Period 3 of the Periodic Table has the largest atomic radius?
A . CI
B.P
C.Na
D. AI
Answers
Answer:
NA
Explanation:
My hypothesis is correct. The experiment and data show heavier objects bounce higher trampolines.
a. Conclusion
b. Experiment
c. Hypothesis
d. question
e. Data
Answers
The answer is A this is a conclusion.
